Improvement in elevators



J. B. s WEEr'rLANn.

ELEVATOR.

, N,174,871. Patented Marh141fe7e.

WITNESSES @JAM B UNITED S'IAJrrizs JEROME B. SWEEIL'AND,

"PATENT OFFICE.

OF PONTIAC, MICHIGAN.

IMPROVEIMENT IN ELEVATORS.

Specication forming part of Letters Patent No. 174,87 l, dated March14,- 1876; application filed February 2l, 1.876.

To all whom it may concern:

Be it known that I, J. B. SwEnTLAND, of Pontiac, in the county ofOakland, and in the State of Michigamhave invented certain new anduseful Improvements in Elevators and do hereby declare that thefollowing is a full, clear, and eXact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, making a part of this specification.

The nature of my invention consists in the construction and arrangementof an elevator for carrying up building material while erecting abuilding, as will be hereinafter more fully set forth.

In order to enable others skilled intheart to which my inventionappertains to make and use the same, 1 will now proceed to describe itsconstruction and operation, referring to the annexed drawing, in which-Figure l is a perspective view of my elevator. Fig. 2 is a detailed viewof the clamp for holding the hoisting-rope on the platformframe.

The frame of my elevator is composed of a horizontal beam, A, t'wo.-upright end beams, B B, and one upright center bar, C, said uprightsforming guides or ways for the platforms. The end guides B pass upthrough mortises in the ends of the horizontal beam A, while the centerupright or guide C passes through a loop, D, on one side of the beam A.If this center guide were set in line with the end guides it would haveto be hollow, so as to let the rope pass down through it the wholelength, which would be a great deal of trouble both to make and to setup 5 but by placing said center upright or guide to one side the rope isfree and clear from top to bottom. The beam A is held to the uprights BB and C, by means of pins @passing through them; and the uprights areintended to project above said horizontal beam a suitable, dist-ance, sothat when the walls of a brick building are laid high enough so that ascaffold is necessary, the three pins may betaken out of the beam, andthe beam raised up4 high enough so that the platforms can come levelwith the scaffold, and Wheelbarrows may be run oi' and on on a level,the beam A being thus adjustable to any height required. The

frame thus constructed is held by means of one truss at each end, eachtruss consisting of an inwardly-beveled sill, ,E, and two inclinedbraces, G G, secured at their upper ends to 'the end guide B. Thesetrusses lanswera threefold purpose. They brace the elevator sidewise andend wise, and the upper ends ofthe braces G form shoulders, upon whichthe beam A is supported. On top of the horizontal beam A, in suitableframes, are mounted pulleys H H, over which the hoisting-rope b passes,the ends of said rope passing through holes in the beam, and areattached to the frames I', supporting the platforms J, by means ofclamps as hereinafter described. The frames I are provided with suitableside guides, d, which straddle the edges of the guides B and C of theframe. K represents an L- shaped lever, pivoted at its angle to one ofthe upper corners of the horizontal beam A, the upper horizontal arm ofsaid lever having asprin g, e, placed underneath, as shown. On the lowerend of the vertical arm of the lever K is formed a hook, f, whichcatches on the upper bar of the platform-frame I, for holding or looking said platform in position. When the lever is pulled down to releasethe platform the spring e is compressed. The clamp for holding thehoisting-rope b to the platform frame I consists of an L- shaped plate,L, fastened to the top bar of the frame on the top and front. From thelower edge of this plate a half-circle, h, extends under said bar. Theropepasses down through a hole in the top barof the frame, around thehalf-circle h and up the front face of the plate L, and the end turneddown again, and then fastened by a separate plate, M, bolted thereon.The plates L and M and circle la have grooves for the passage oftherope, as shown. The. circle h is for the purpose of preventing the ropeturning any sharp corners before it is clamped, which would wear itthrough. On top of the platform-frame I are hed-racks N, which may beadjusted by bolts up Iand down t suit the height of the men.Thehoistingrope b passes around sheaves k k in a jack, O,

at the foot of the center guide C, and the ropepasses around thehorse-jack P, which is pivoted on a bedplate,R, and adjusted by means ofa set screw, m, to take up the slack in the rope or cable. In practicethe horse-jack I will be on the lower oor, and the trusses secured onthe joist-s or braces for the door above. It will be seen that twoplatforms are used, one going up while the other is ging down. On theunder sideofthe adjustable top beam A is a bumper, p, of rubber or othersuitable material, to take ol the jar or concussion of theplatform-frame as it strikes said beam in ascending.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. In an elevator-frame, the combination of the horizontal adjustablebeam A, the vertical end guides B B, passing through said beam, and thevert-ical center guide C, passing through a loop, D, on one side of thebeam, substantially as and for the purposes herein set forth. -l Y 2.The combination of the beveled bars E` E, braces G G, vertical endguides 'B B, and the horizontal adjustable beam A, all constructedsubstantially as and for the purposes herein set forth.

3.` The combination, with the beam A, of the angularvlever K, pivoted toa plate or casting `ring-rope 1) pulleys H H, jack O, with pulleys k 7c,and adjustable horse-jack P, with sets'c'rew m, substantially as and forthe purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this21st day of January, 1876.

.'TEROME B. sWEETLAND.

lVlitnesses':

J. IEN EYCK, l FRANcIsM. WHEELER.

